Improvement in indirect steam-radiators



Patented Dec. 30,1873.

MILLS.

Indirest Steam Radiators.

I [liven/Z01 -M Mia/v, v;

AW. PHOM-UTHOGRAPII/C 604 M )fmssakmss moans) j UNITED STATES PATENTGrrrcn JOHN H. MILLS, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN INDIRECT STEAM'RADIATORS.

Specification forming part of Letters Patent No. 145,961, datedDeccmberEO, 1873; application filed October 1, 1873.

To all whom it may concern Be it known that I, JOHN H. MrLLs, of Boston,in the coimty of Suffolk and State of Massachusetts, have inventedcertain new and useful Improvements in Indirect Steam-Radiators; and Ido hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it pertains to make and use it, reference being had to theaccompanying drawings, which form part of this specification.

My invention relates to that class of heating apparatus, for privateresidences or other buildings, in which the heating-surfaces are placedin chambers or boxes outside the room that is to be warmed, andgenerally located in the basement, to which the air from outside thebuilding is conducted, and, after being raised to the requiredtemperature by passing over coils of pipe or radiators filled withsteam, is

admitted to the different apartments, as desired; and my inventionconsists, first, in the peculiar form of tube, which I have styled acompound gothic tube, formed by describing four gothic members at equaldistances aroimd a circle.

The casting or radiator in this case is arranged difierently from thedirect radiator described, as the work to be done and the conditions areunlike.

In indirect heating, instead of single, or at most double, radiators, itis often desired to mass large quantities of surface in the leastpossible room consistent with the passage of air through them to theregisters; and to insure successful operation, such surface must beplaced so that the air is free to ascend with out passing too rapidly orin a semi-heated condition.

To accomplish this, together with other desirable results, I havearranged my heatingsurface, formed of the gothic tube mentioned, invertical rows, but with change of position and connection, to enablesuch tubes to interlock each other, so thatthe airspace in and aroundthem shall be reduced to a minimum, while the steam or heating surfaceis increased. To further simplify the connections, or rather the supplyof steam and discharge of condensed water, I make this radiator, likethe direct, in

one homogeneous casting, supplied with steam f at the top anddischarging the condensed water and air at the bottom. These castings orradiators, when aggregated or placed side by side, and supplied withsteam from outside the chamber, and the drip delivered to a separatepipe, form a stack of heating-surface, which is complete without anyjoints within the chamber.

On the drawing, Figure 1 represents a ground plan of my invention. Fig.2 represents a longitudinal section on the line A B, shown in Fig. 1.Fig. 3 represents a side ele vation, and Fig. 4. represents across-section, on the line C D, shown in Fig. 3.

Similar letters refer to similar parts wherever they occur on thedifferent parts of the drawings. v I

a represents the air chamber, having an opening, I), at the bottom forthe admission of the air that is to be heated, and another open ing, 0,at the top for the delivery of theheated air to any part of a buildingthat is to be warmed. The radiators d d d d d'are each made in oneentire piece without any joints or connections whatever, except wherethey are connected to the steam and drip pipes. The said radiatorsconsist each of two horizontal tubes, (1 d, one at the top and one atthe bottom of the radiator, which are cast in one piece with a number ofvertical compound gothic tubes, 61' d d, of a section shown in Fig. 4.The horizontal tubes d d are cast with a se ries of swells locatedcentrally with the ver tical gothic tubes 61' d, and one radiator isplaced in the air-chamber a in a relative posi tion to the next one, asshown in Fig. 1, so that the swells on one radiator come in the hollowsbetween the swells of the next radiator. A small space, is however, leftfor the air to pass between horizontal tubes (1 d, as shown.

As the vertical compound gothic tubes d d are arranged centrally withthe swells on the horizontal tubes d d, it follows that the saidvertical tubes of one radiator come in the spaces between the verticaltubes of the next radiator,'and so on through the whole series ofradiators that are used. In this manner I am able to obtain the largestpossible heating surface in a very small and compact chamber and as theair that is to be heated is brought in very intimate contact with theradiators, as above arranged, I am able to heat a large volume of air ina very short time, as compared with the ordinary radiators now generallyemployed.

The steam is conducted to the radiators through the pipe 6 that isscrewed in a castiron drum, f, provided with a number of branches, 9 g gg g, one for each radiator d cl (1, as shown in Fig. 1. The drum f isconnected to the radiators d d d by means of the pipes h 7 h h screwedin the radiators and the branches 9 g g, and provided with thecheck-nuts t 11 i, as shown. A similar drum, f, with its branches 9 g g,pipes h h h, and checknuts z" i i is arranged at the lower ends of theradiators for the purpose of allowing the condensed water and air toescape through the drip-pipe 0, shown in Figs. 2 and 3.

closing air-chamber, and water and steam drums arranged outside of saidchamber and communicating through separate and distinct connections witheach independent radiator, substantially as herein shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this1st day of September, 1873.

JOHN H. MILLS.

Witnesses ALBAN ANnmiN, GEORGE E. PHELPS.

